Machine for bending pipe



C. GABRIELSQN MACHINE FOR-BENDING PIPE Filed June 21. 1922 4Sheets-Sheet 1 July. 24, 1923.

C. GABRIELSON MACHINE FOR BENDING PIPE Filed June 21. 1922 4Sheets-Sheet 2 C. GABRIELSON I MACHINE FOR BENDING PIPE July 24, 1923.1,462,935

Filed June 21. 1922 4 Sheets-Sheet 5 C. GABRIELSON MACHINE FOR BENDINGPIPE Filed June 21. 1922 4 Sheets-Sheet 4 Z? 7% KU/m G T-tom wayPatented July 24, 1923.

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CARL GABRIELSON, or SYRACUSE. NEW YORK, ASSIGNOR r NEWELL'M NUFAGTUR- ING COMPANY, OF OGDENSBURG, NEW YORK, A. CORPORATION OF MAINE.- 1

MACHINE non iznnnrive rrrn.

Application filed .Tune 21 1922. Serial No. 569,901.

"Syracuse, in the county of Onondaga and State of New York, haveinvented certain new and useful Improvements in Machines for BendingPipe, of which the following is a specification.

This inventionrelates to improvements in machines for bending pipe, andhas for its object to provide novel and simple means for forming quarterand other bends on the ends A particular ob- "ject of the invention isto provide a powerdriven .mechanism for bending the ends of of brass andothertubing.

the thin tubing which comprises the telescoping parts. of the well-knownextensible curtain rods in common use. object is to improve and simplifythe construction, arrangement and operation of pipe-bending machinesgenerally.

I attain these objects by the means set forth in the detaileddescription which follows and as illustrated by the accompanyingdrawings, in which Figure l is a top plan view of themach-ine ready tostart a bending operation. Fig. 21s an enlarged detailed section, takensubstantially on line 22 of Fig. 1. Fig. 3 isa front side elevation ofthe machine. Fig. 4 is a front end elevation of the machine shown inFig. 1. Fig. 5 is an elevational view of an extensible curtain rod. Fig.6 is a View of the bending gear. Fig. 7 is respectively an edge and. afaceview of the locking and bending die. Fig. 8 is: a plan view of thecircular rack. Fig. 9 is a View showing the position of the workingparts at the end of a bending operation. And Fig. 10 is a similar view;showing the manner of ejecting the bent tubing.

In the drawings, 2 represents the base, from which rises an irregularhollow frame, comprising substantially parallel sides 2-2"-, whichvirtually inclose and support the whole mechanism. 3 represents the mainshaft, to the end 8 of which, a motor (not shown) may be connected, theopposite end beingfitted with'a hand-wheel 3*, for use in adjusting thevarious working parts. The shaft 3 is journalled in the frame sections2'-'2 This shaftcarries a pinion 3 which'meshes'and drives a relativelylarge gear 4, the latter being mountedon a shaft And a further a, whichparallels the shaft 3'." The gear 4 is provided in its'inner face withfour or more sockets l which are preferably spaced equidistantly aroundthe circle, as best'seen in Fig. 3. The gear at throughout the drawngsis shown conventionally for clearness. During the bending operations,the gear a is driven constantly through its connection with the shaft 3,and the said gear is arranged to intermittently drive a drum'cam, 5,which isloosely journalled on the shaftfi, the said drum beingoperatively connected with the gear 4, by means of a drive-bolt 6, whichis reciprocable in i a longitudinal socket 6. The bolt 6 is constantlyunder oal- 6 I I a which traverses a slot 6 in the clrcumferployed fordisengaging the bolt GfrOm'the The bolt 6 is controlled automaticallybya reciprocable cam-bar 8, which is supported by abracket 8 carried bythe frame 2', the said cam-bar being positioned horizontallysubstantially in line with the aXis'of the drum 5, and being normallyheld against the surface of the said drum, by a tension spring 8. Thefree end of the bar 8 is provided sis the control of a spring 6 whichexerts its tension for forcing the said bolt towards the 4-. The belt 6carries a stop-pin 6,

wi-th a bevel cam surface 8 which is dis posed in the path of the:stop-pint, whenthe bolt 6 and said pin are in theldriving position,shownby-the full lines in Figs. 1

and 4;. The arrows inFigs-i l, 3, 4, 9 and 10 indicate the direction oftravel of the gear 4 and the drum 5. bending operation the pin 6,on'reaching the line of the'horizontal axis of the drum' =5, encountersthe cam face 8 which forces the pin and the bolt 6 away from the gear Atthe end of each a 4- sufficiently to break-the driving connectionbetween said parts. The drum 5 will then come to a stop due to thepressure exerted by the bar 8, which is under tension of.

the spring 8 The said bolt'and pin-will then remain in the releasedposition, until the camb-ar 8 is withdrawn, for allowing the spring 6 toshoot the bolt 6 into the first socket P of the gear't that comes intoregistry with said bolt. The cam-bar 8 lswithdrawn by means of alink 9,which connects 'withthe bar by a pin 9,'and by a second 1.,pipe, as P,will now be described: represents a vertical shaft, which is disposednear,

the front end of the frame, at right angles to they shaft 4. Near thebottom end of shaft 10 is mounted a mutilated .gear 11,

which is made rigid by a, key 10". .Imme

diately above; the gear 11, shaft 10 is indireetly supported by abearing 12 comprising a part of a bracket 12, which may be an integralpart ofthe rear frame portion 2*.

l 'The bearing12 directly-supports a bushing 13,= in which the shaft 10is eccentrically disposed, as best seen in Figs. 1, 9 and 10. Thebushing 13 preferably extends from the gearll to a point near the topend of. shaft 10. Immediately above the bearing 12 is disposed a sleeve14, and upon this sleeve is rigidlymounted another mutilated gear 15,which with the said sleeve is rotatable on the bushing 13. Directlyabove thegear 15, the sleeve 14 is enlarged and forms an integral hub16, of a bending-die bracket 16.

Thebracket 16 comprises-a horizontal arm,

which is fswingable substantially 90, during thebending operations, onthe sleeve 13 as its axis, The top end of the bushing 13 is supported ina stationary horizontally disposed bracket 17, which is supported by theframe 2 ,:and whose inner or free end com-' prises a circular rack 17(see Fig. 8).. This circular rack is disposed in the same plane as astraight rack 16? carried by the bracket 16,;and the latter rack isarranged to mesh withthe rack 17 during the quarter-swinging of thebracket 16, which effects the bend- 'ing of the pipe P- 18 represents astation ary die,.which is provided with a semi-cylindrical mold 18,thatconforms to and. .partially receives the pipe P when it is firstinserted in the machine preparatory to the shown in Figs. 1, 3 4; and10.

bending of the said end. The die 18 is also supported, by the frame 2,and its inner end forms a stop againstwhich a shoulder 16 of the bracket16 abuts, when the said bracket is in the extended or idle position, 16represents another straight half-cylindrical die carried by the bracket16 directly above the rackltl, and which aligns with the mold 18- whenthe parts are in the position,

shownin-Figs. 1 and 10. 19 represents a locking and bending die, whichis substantially diamond-shaped in plan, and which is rigidly secured tothe top end of the shaft To start the bending- 10. The part 19 isprovided with a semi-eylindrical mold for partially receiving the pipeF,the said mold extendingin the form of a right-angle curve along two ofits margins, which face respectivelythe rear side and end of the frame,and'isdisposed directly in line horizontally with thepipe P,

both beforeand during the bending operation, as best seen in Figs. 1 and10. At the start of the bending operation, the end of the pipe P to bebent, is inserted horizontally between the dies 18 and 1.9 (while thelatter die is in the released position. shown in Fig. 10), until thesaid end of the pipe engages a stop 20 carried by the bracket 16/ As theend of the pipe moves inwardly beyond the dies 18 and 19,'the pipetelescopically receives the free end of a corerod or mandrel 21, whichsupports the said end,

throughout the bending operation. The core 21 is adjust-ably supportedby the free end 16 ofthe bracket 16 by means of nuts 16. The core 21moves with the bracket 16 and serves the dual purpose of supporting andbending the end of thepipe P, as well as that of preventing thecollapse, crimping or distorting of the pipe while it is being bent.Thebending of the pipe P is effected directly by a segmentalv gear 22,the latter I,

being an integral part of a 'relativelylong lever 22 and is pivoted at22 near the rear end of the frame. The lever 22 and gear 22' aredisposed in the same plane as the gear 15, and the segment. 22 meshesand drives the said gearin the direction for effecting the bending ofthe pipe P. The lever 22 is moved from the position shown in Fig. 1, tothat shown in F ig. 9, and said lever is swung back and forth in ahorizontal plane during and after each bendingoperation, by

the .drum cam 5, and. for this purpose the said lever is provided with adrive-pin 22 which is disposed in and traverses a circum= ferentialcam-groove 23 of the said drum, as best seen in Fig. 3; The drive-pin 22is always positioned directly above the axis of the drum 5, and thegroove 23 is arranged to move the lever 22 from' the position shown in.Fig.1 to that shown in Fig;

9 and thence back to the'positions shown in Figs. 1 and 10, during eachrevolution In order to carry out of the drum 5. the several steps of thebending operation it is necessary that the lever 22 remain sta:- tionarywhile the drum is still rotating, and for this purpose a portion, as 23of the cam-groove 23, is neutral, as will be understood by consultingFigs. 1, 9 and 10. The

rows in Figs. .1, 3, 4:, 9 and 10. By referring to Fig. .1, whichcorresponds to the drum 5 revolves in the direction of the a'rstartingposition, it will be understood that the drive-pin 22"" must'follow theangular portion 23 of the groove. 23, whiehcarries the,lever 22inwardly. This causes the segthe swinging of the bending bracket 16, as.from the full line position in Fig. 1, to that shown in Fig. 9. Thiseffects the bending.

ment 22' to rotate the gear 15, which effects of the inner end of thepipe P around the right hand edge of the die 19, thereby efiecting aquarter bend of the said end, as shown in Fig.9. As the pipe P is beingbent around the die 19, the mandrel 21 is partially withdrawn from thepipe, as shown by dotted lines in Fig. 9. When the lever 22 and the.other parts reach the positions, shown in Fig. 9, a second lever 24 ofsimilar construction and arrangement and having a segment gear 24:,which meshes; with the mutilated gear 11 and which has been temporarily.held stationary, as shown in Figs. 1 and 9, starts to swing inwardlytowards the longitudinal center of the ma chine, as from the positionshown in Figs. 1 and 9, to that shown in Fig. 10. This inward movementof the lever 2 1 which is effected by a drive-pin 24 which plays, in acam-groove 25 of the drum, rotates the ,shaft 10, and also thedie 19around the axis of the shaft 10. This correspondingly rotates the die19, which owing to the eccentricity of theaxis of the shaft 10relatively to the axis of the bushing 13, swings the die .19 away fromthe stationary die 18 (compare Figs. 9 and 10), and frees the pipe Pfrom the latter die. While the lever 24 is being moved inwardly, asdescribed, the lever 22 is carried by the return angular portion 23ofthegroove 23, back towards the neutral part of said groove until saidlever reaches the position shown in Figs. 1 and 10. At the end of thislatteroperation the core 21, and the corresponding endof the pipe P, areagain positioned substan tially parallel to the aligning dies .18 and16. By the time the lever 24 .reaches the position shown in Fig. 10, thestop-pin 6 encounters the cam-bar 8, which disconnects the bolt 6 fromthe gear 4 and stops the drum 5. This leaves the lever 24. in theaforesaid operated position.

10, the bent tube P is ejected and thrown clear of the machine (seedotted lines in Fig. 10), by'an ejecting lever 26, which is pivoted at26', in the. line of the mold. of the die 19, (see Figs. 1, 9 and 10).The ejector 26 is thrust outwardlv by a pin 27, whichis driven by thetension of a spring 27,, all of the said parts beingdisposed' in asocket27, of the die 19, as shown in Figs. 1, 4 and 10.

After the bent pipe has been ejected-the op-.

When the die 19 is rotated to the position shown in Fig. i

by suitably adjusting certain parts of the machine, in a well-knownmanner.

Having thus described myinvent-ion, what I claim, is. ,7

1. In a pipe bending machine, a stationar die, a locking die movabletowardsanc. away from the stationary die, a shaft for supporting thelocking vd rotatable on an axis that is eccentric to the axis. of thelocking-die shaft, gears for intermittently rotating said shaft forfirst looking and then releasing a pipe, and a train of gears forrotating said bending die while the locking die is held stationary.

2. In a pipe bending machine, a plurality of pipe dies, one of said diesbeing sta- 131011313 the other dles belng movable, one of the movabledies adapted to hold a porie, a bending die.

tion of the pipe rigid while the'othermovable die, is bending the end ofthe pipe, said holding die being rotatable on an axis that is eccentricto the axis of the bending die, means for moving the holding die towardsand away from the stationary die before and after the bending operation,and" means for rocking the bending die towards tion of thepipe rigidwhilethe "other movable die is bending the end of the pipe, said bendingdie being rotatable on an axis that is eccentric to the axis of theholding die,-a' mandrel carried by the latter die and telescoping thesaid end, means for moving-the holding, die towards and away from'thestationary die before and after the bending operation, and means forrockingthe bending die towards and away from the holdingdie. v

4:. .In a pipe bending machine, a stationary die, a locking die movabletowards and away from the I stationary die, a shaft for.- supportinglocking die. a bending. die

. swingable on an axis that iseccentric to the axis of said shaft, asegment gear for intermittently.actuating said shaft for first lockingand thenreleasing a pipe, a segment gear for swingingthe bendingdietowards and away from the l'oclri-ng'die, and a cylindrical cam foractuating both of said seg-' ment gears. I

5. A. pipe-bending machine, including a stationary die, a locking themovable towards and away fronrthe stationary die,

a shaftfor supporting and actuating said locking die, a bending dierockable on an axis which is eccentric. to the axis of the locking die,gears for moving the bending die in the direction for bending a pipeWhile the locking die is stationary, gears for rocking the locking dietowards and away from the stationary die, and means for moving a pipe,.a train of gears for rotating the the bending die in the oppositedirection while the locking die is being moved in the direction forreleasing the pipe.

6. In a pipe bending machine, a stationary die, a locking die movabletowards and from the stationary die, ashaft for actuating the lockingdie, a bending die swingable towards and away from said locking die,gears for intermittently rotating said shaft in opposite directions,gears for intermittently. swinging said bending die, and a mandreltelescoping the end of a pipe and movable with the bending die and saidend during the rocking movements of said die.

7. In a'pipe bending machine, a stationary die, a locking the movabletowards and away from the stationary =die,'-a shaft for actuating saidlocking die, .a bending die rotatable on an axis that is eccentric tothe axis of the locking die, gears for intermittently rotating saidshaft for locking and releasing bending die while vthe lock-ingdie isheld stationary, a cylindrical cam for actuating all of said gears,means for intermittently operating said cylindrical cam, and means forstarting and stopping said cylindrical cam.

8. In a pipe bending machine, a stationary die, a locking die movabletowards and away from the stationary die, a shaft for supporting thelocking die, a bending die swingable on an axis that is eccentric to theaxis of said shaft, a segment gear i'orintermittently actuating saidshaft for first locking and then releasing a pipe, means forejectiiigtlie pipe at the end ofsaid releasing movement, a segment gearfor swinging-the bending die towards and away from the lockingdie, and acylindricalcam for actuating both-0f said segment gears.

9. In a pipe bending machine, a stationary die, a locking die movabletowards and away from the'stationary die for locking and releasing apipe, a shaft for actuating said locking die, a bending die rotatable onan axis that is eccentric to said shaft, means for moving said bendingdie towards the locking die while the latter is in the lockingposit1on,,1neans for moving saidbending die in the opposite directionwhile the locking die'is being moved towards the released position.

10. In a pipe bending machine, a stationary die,ia locking die movabletowards and away from the stationary die for locking and releasing apipe, ashaft for actuating said locking die, a bending die rotatable onan axis that is eccentric to said shaft, means for moving said bendingdie towards the locking 'die while the naeis in the locking position,means for moving said bending d1e 111 the opposite direction while thelockingdie is being moved. towards the released posit on, a mandrelcarried bythe bending die for supporting the end of the pipe during thebending operation, and means carried by the bending die, a second leveractuated by said" cam for moving said locking d1e, a constant-i lyrotating gean neans for o peratively connecting said drum cam withsa1dgear,'means for starting said drum cam for eiiectingthe locking of apipe, and means for stopping said drum cam at the end of the ben'dingoperation.

12. In a pipe bending machine ,a constantly rotating member, afdrum-camadapted to so I be intermittently rotated by said 'n1ember,

means for operatively connecting said drumcam and said member at thestart of the pipe bending operation, means for. disconnecting,

said drum-cam and sai'dmember at the end of the bending operation, alocking die movable for locking and releasing the pipe, a

shaft for supporting said die, gears for operatively connecting saidshaft with said drumcam, a bending die movable towards and. away fromsaid locking die, and gears for operatively connecting said bendingdie'with said drum-cam.

13. In a pipe bendingmachine, a. stationary die, a locking die movabletowards and away fromthe stationary die, a shaft for supporting thelocking die, .a bending .di'e swingable on an axis thatis eccentric tothe axis of said shaft, 2). segment gear for intermittently actuatingsaid shaft for firstlocking and then releasing a pipe, means carried bythe lockingdie for ejecting the pipe at the end of said.releasingmovement, ,a segment gear for swinging the bending die towardsand away from the locking die whilethe latter die is in the lockin fposition, a cylindrical cam for actuating oth of said segment gears,means for driving saidcylindrical cam, means for stopping said cylin-'drical cam at the end of the releasing opera tion, and means forstarting said cylindrical cam-in advanceof each locking operation.

In testimony whereof Iafiix my signature.

CARL GABRIELSONL

